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A058456
as a simple table
n
a(n)
1
9
2
80089
3
90809009099908808089808090889
4
89898988900998890088080098089989880890999988989999809
[9,80089,90809009099908808089808090889, 89898988900998890088080098089989880890999988989999\ 809]